Manual sampling combination valve

Abstract

The utility model relates to a manual sampling combination valve, which can simultaneously realize the functions of flow regulation and control and pressure relief protection, and is characterized by comprising a valve body (A), a valve head (B), a flow path and a safety bypass pressure control piece (C), the valve head is mounted on one side of the valve main body (1) of the valve body to control opening and closing of a medium and regulate and control the flow of the medium; the safety bypass pressure control part is fixed on the other side, opposite to the valve head mounting side, of the main valve body of the valve body so as to play a role in safety protection in equipment; a flow regulation and control cavity and a safe pressure regulation and control cavity are formed in the two sides in the valve body respectively, are not penetrated and are isolated through an interlayer; the flow path comprises two medium flow channels; the valve body further comprises a water inlet channel and a water outlet channel. And the distance between the water inlet channel and the circulating channel on the interlayer on the side of the safe pressure regulation and control cavity is smaller than the distance between the water outlet channel and the circulating channel on the interlayer on the side of the safe pressure regulation and control cavity.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of precision valve, especially relates to a flow adjustable and pressure relief protection manual sampling combination valve. BACKGROUND

[0002] The existing sampling system uses two fittings of manual sampling valve and safety valve to regulate flow and protect against overpressure, so as to meet the system functional requirements.

[0003] (1) The manual sampling valve is a device used to determine the accuracy of the online instrument in the instrument online continuous monitoring, and its function and role are to adjust the manual sampling flow and control the pressure of the pipeline, and the normal control flow range is 500-800 milliliters per minute, and the pressure range is 0-2 kilograms. And it is used for comparison and calibration of laboratory instruments and online instruments, and is arranged at the sampling position measured by the laboratory instrument for manual sampling. The sample water measured by the manual sampling and the online instrument is also continuously flowing sample water, and the real-time monitoring is the water quality of the boiler represented by the sample water.

[0004] (2) Under normal circumstances, the safety pressure of the equipment is controlled between 0.6-0.8 megapascal, and the safety valve is needed at this time. The safety valve is used for the safety protection of the sample water to the instrument and the fitting in the equipment. When the pressure of the equipment exceeds the specified value, the safety valve opens to directly discharge part of the sample water from the system, so that the online instrument and the fitting can normally operate.

[0005] The use of two fittings of manual sampling valve and safety valve to regulate flow and protect against overpressure results in a large number of corresponding fittings, thereby causing high production labor cost and large installation equipment space.

[0006] Therefore, there is a technical requirement to organically combine the manual sampling valve and the safety valve to form a combination valve body, so as to simultaneously realize flow regulation and pressure relief protection. INVENTION CONTENTS

[0007] The utility model discloses a kind of manual sampling combination valves of adjustable flow and pressure relief protection, manual sampling valve and safety valve are redesigned on the same valve body, make the flow control function of manual sampling valve and the pressure relief protection function of safety valve be combined together, so as to integrate the two functions of flow regulation and pressure relief protection, reduce the number of required fittings, greatly reduce high production labor cost and installation equipment space.

[0008] The utility model provides

[0009] A manual sampling combination valve can simultaneously realize the functions of flow regulation and pressure relief protection, characterized by comprising: a valve body (A), a valve head (B), a flow path and a safety bypass pressure control (C). Wherein:

[0010] The valve head (B) is installed on one side of the valve body (1) of the valve body (A) to control the opening, closing and flow regulation of the medium; the safety bypass pressure control (C) is fixed on the other side of the valve body (1) of the valve body (A) opposite to the installation side of the valve head (B), so as to play a safety protection role in the equipment.

[0011] A threaded step slightly smaller in diameter is arranged on the outer side of both ends of the valve body (A), and the valve body (A) is threadedly connected with the valve head (B) and the safety bypass pressure control (C) through the threaded step.

[0012] A flow regulation cavity and a safety pressure regulation cavity are respectively arranged on both sides in the valve body (A), and the flow regulation cavity and the safety pressure regulation cavity are not penetrated and are isolated by a partition layer.

[0013] The flow path includes two medium flow channels, two circular holes are arranged on both sides of the partition layer as the two medium flow channels, and the two medium flow channels are respectively a flow-through channel on the partition layer on the safety pressure regulation cavity side and a flow-through channel on the partition layer on the flow regulation cavity side.

[0014] The valve body (A) further includes a water inlet channel and a water outlet channel; the distance between the water inlet channel of the valve body (A) and the flow-through channel on the partition layer on the safety pressure regulation cavity side is less than the distance between the water outlet channel of the valve body (A) and the water inlet channel and the flow-through channel on the partition layer on the safety pressure regulation cavity side.

[0015] Preferably, the manual sampling combination valve further includes a fastening fixing member, a sealing member and a sleeve joint (17); the fastening fixing member includes first and second fastening nuts (4, 12) arranged symmetrically left and right; the sealing member includes first and second Teflon pads (2, 16) and first and second O-rings (5, 11) arranged symmetrically left and right; the sleeve joint (17) is threadedly connected to both sides of the valve body (1); and the first O-ring (5) is arranged in the safety bypass pressure control (C).

[0016] Preferably, the valve body (A) further includes a water inlet channel and a water outlet channel; the distance between the water inlet channel of the valve body (A) and the flow-through channel on the partition layer on the safety pressure regulation cavity side is 3 mm; and the distance between the water outlet channel of the valve body (A) and the water inlet channel and the flow-through channel on the partition layer on the safety pressure regulation cavity side is 4 mm.

[0017] Preferably, both sides of the middle section of the outer circular surface of the valve body (A) have two threaded holes, and a planar circular groove coaxial with the threaded holes is arranged.

[0018] Preferably, the valve head (B) comprises a handle (13), a circlip (14), a pull rod (15) and a flow regulating needle (10); wherein:

[0019] One end of the pull rod (15) is provided with a small annular groove, and the pull rod (15) is fixed on the handle (13) through the circlip (14); the other end of the pull rod (15) is provided with a large annular groove, and one end of the pull rod (15) provided with the large annular groove is clamped on the clamping groove of the flow regulating needle (10);

[0020] The handle (13) is fixed on the valve body (A);

[0021] The flow regulating needle (10) is placed in the flow control cavity, the upper end of the flow regulating needle (10) is provided with a detachable connecting rod hook and a clamping groove, the middle end is provided with an annular groove, the lower end is provided with a tapered groove, the bottom of the tapered groove is a flat surface, and a variable-diameter tapered tip is arranged at the center of the tapered groove; the flow regulating needle (10) is hung together with the pull rod (15) through the detachable connecting rod hook and the clamping groove arranged at the upper end of the flow regulating needle (10), and is indirectly connected with the handle (13);

[0022] The flow regulating needle (10) moves up and down in the flow control cavity of the valve body (A) under the driving of the pull rod (15) and the circlip (14) with the rotation of the handle (13), thereby changing the contact area of the variable-diameter tapered tip of the flow regulating needle (10) with the valve body (A), and changing the size of the sample water flow.

[0023] Preferably, the safety bypass pressure control (C) comprises a safety pressure sealing needle (9), a safety pressure sealing needle holder (8), a spring (7), a fixed cap (3) and a safety pressure adjusting rotary rod (6); wherein:

[0024] The fixed cap (3) is fixed on the valve body (1), and is sealed outside the first Teflon pad (2) and the second Teflon pad (16);

[0025] The safety pressure sealing needle (9) is clamped in the safety pressure sealing needle holder (8); one side of the safety pressure sealing needle (9) is conical, and the opposite side is cylindrical, and the contact surfaces of the safety pressure sealing needle (9) are equal in radius;

[0026] One side of the safety pressure sealing needle holder (8) is provided with a boss coaxial with the center, and an un-penetrated coaxial circular groove is arranged on the plane of the boss;

[0027] The safety pressure adjustment rotating rod (6) is provided with a circular groove on one side and an internal hexagonal groove on the opposite side, and a circular ring boss is arranged in the middle of the safety pressure adjustment rotating rod (6), and a ring groove is arranged in the middle of the circular ring boss.

[0028] The spring (7) is arranged in the groove of the safety pressure adjustment rotating rod (6) and the safety pressure sealing needle holder (8).

[0029] The safety pressure sealing needle (9), the safety pressure sealing needle holder (8), the spring (7) and the safety pressure adjustment rotating rod (6) are sequentially arranged in the safety pressure control cavity of the valve body (A).

[0030] Preferably, the first O-shaped sealing ring (5) is sleeved in the ring groove of the safety pressure adjustment rotating rod (6).

[0031] Preferably, the safety pressure adjustment rotating rod (6) is provided with threads on the outside, and the spring (7) is connected through the threads.

[0032] Preferably, the inside of the fixed cap (3) is provided with a non-full-section-threaded cavity connected with a through hole, and the outside of the fixed cap (3) is a full-section-threaded step.

[0033] Preferably, the second O-shaped sealing ring (11) is sleeved in the ring groove of the flow adjustment needle (10), and the outer diameter of the second O-shaped sealing ring (11) is greater than the inner diameter of the flow control cavity, so that a sealing effect is formed when the flow adjustment needle (10) moves up and down.

[0034] The manual sampling combination valve has the following beneficial effects:

[0035] (1) The valve body has two cavities on both sides, one side is a flow control cavity, and the other side is a safety pressure control cavity, in addition to the function of opening or controlling the flow size, the manual sampling combination valve also has the function of pressure relief protection, so that the combination valve has the functions of flow control and pressure relief protection.

[0036] (2) The safety pressure sealing needle with a taper head is used at the pressure relief protection position, so that the safety pressure sealing needle can be butt-jointed with the channel axis during sealing, and the sealing effect is better.

[0037] (3) The flow adjustment needle has a taper groove at the lower end, which can stabilize the sample water pressure and stabilize the medium flowing through the flow adjustment needle, so as to ensure that the medium flows smoothly through the valve body; the flow adjustment needle is hung together with the pull rod through the slot at the upper end, and is indirectly connected with the handle, and the slot design facilitates the disassembly and assembly of the handle and the pull rod.

[0038] (4) the components of the pressure relief protection function mechanism, including: a threaded safety pressure adjustment rotating rod, which changes the spring pressure of the pressure relief chamber, thereby controlling different safety pressure relief pressures.

[0039] (5) Precise control of manual sampling flow and safety control of discharge pressure in the steam-water sampling device, ensuring safe use of instruments and accessories, lengthening the needle tip length, more accurately controlling the sample water flow size, and having a pressure relief protection function, and the safety pressure relief pressure size can be randomly adjusted within a controllable range. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present application, the following will briefly introduce the drawings needed to be used in the specific embodiments or related technology description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0041] Figure 1 It is a perspective view of the manual sampling combination valve of the present application.

[0042] Figure 2 It is a front view of the manual sampling combination valve of the present application.

[0043] Figure 3 It is a B-B sectional view of the manual sampling combination valve. Figure 2

[0044] Figure 4 It is a medium flow direction schematic diagram of the manual sampling combination valve of the present application under the condition that the system safety pressure is not exceeded.

[0045] Figure 5 It is a medium flow direction schematic diagram of the manual sampling combination valve of the present application under the condition that the system safety pressure is exceeded.

[0046] Reference signs:

[0047] 1, valve body, 2, first Teflon pad, 3, fixed cap, 4, first fastening nut, 5, first O-shaped sealing ring;

[0048] 6, safety pressure adjustment rotating rod, 7, spring, 8, safety pressure sealing needle holder, 9, safety pressure sealing needle;

[0049] 10, flow regulating needle, 11, second O-shaped sealing ring, 12, second fastening nut, 13, handle, 14, snap spring;

[0050] 15, pull rod, 16, second Teflon pad, 17, clamping sleeve joint. DETAILED DESCRIPTION​

[0051] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0052] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0053] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] As shown in Figures 1-4 The first aspect of the present application provides a hand sampling combination valve, which can simultaneously realize the functions of flow control and pressure relief protection, comprising: a valve body A, a valve head (B), a flow path and a safety bypass pressure control C; wherein:

[0055] The valve head B is installed on one side of the valve body main body 1 of the valve body A to control the opening and closing of the medium and to control the flow of the medium; the safety bypass pressure control C is fixed on the other side of the valve body main body 1 of the valve body A opposite to the installation side of the valve head B, so as to play a safety protection role in the equipment;

[0056] The valve body A is provided with a flow control cavity and a safety pressure control cavity on both sides, respectively, the flow control cavity and the safety pressure control cavity are not penetrated and are isolated by a partition;

[0057] The flow path includes two medium flow channels, which are respectively a flow channel on the side of the partition layer of the safety pressure regulating cavity and a flow channel on the side of the partition layer of the flow regulating cavity by setting two round holes on both sides of the partition layer as the two medium flow channels.

[0058] As a preferred embodiment, the valve body A further includes an inlet water channel and an outlet water channel; in order to ensure sampling flow control and safety pressure relief, the distance between the inlet water channel of the valve body A and the flow channel on the side of the partition layer of the safety pressure regulating cavity is 3mm; the distance between the outlet water channel of the valve body A and the flow channel on the side of the partition layer of the safety pressure regulating cavity is 4mm; when the system pressure reaches a dangerous pressure, the pressure can be quickly released.

[0059] As a preferred embodiment, the outer circular surface of the valve body A has two threaded holes on both sides of the middle section, and a planar circular groove coaxial with the threaded holes is arranged.

[0060] As a preferred embodiment, the outer side of both ends of the valve body A is provided with a threaded step with a slightly smaller diameter, and the valve body A is threadedly connected with the valve head (B) and the safety bypass pressure control C through the threaded step.

[0061] As a preferred embodiment, the manual sampling combination valve further includes a fastening fixing member, a sealing member and a sleeve joint 17; wherein the fastening fixing member includes a first fastening nut 4 and a second fastening nut 12 arranged symmetrically on the left and right sides; the sealing member includes a first Teflon pad 2 and a second Teflon pad 16 arranged symmetrically on the left and right sides, and a first O-shaped sealing ring 5 and a second O-shaped sealing ring 11; the sleeve joint 17 is threadedly connected on both sides of the valve body 1; the first O-shaped sealing ring 5 is arranged in the safety bypass pressure control C.

[0062] As shown in Figures 3-5 As a preferred embodiment, the valve head B includes a handle 13, a clamping spring 14, a pull rod 15 and a flow regulating top pin 10; wherein:

[0063] One end of the pull rod 15 is provided with a small annular groove, and the small annular groove fixes the pull rod 15 on the handle 13 through the clamping spring 14; the other end of the pull rod 15 is provided with a large annular groove, and one end of the pull rod 15 provided with the large annular groove is clamped on the clamping groove of the flow regulating top pin 10;

[0064] The handle 13 is fixed on the valve body A;

[0065] The flow regulating needle 10 is placed in the flow regulating cavity, the upper end of the flow regulating needle 10 is provided with a detachable connecting rod hook and a clamping groove, the middle end is provided with an annular groove, and the lower end is provided with a taper groove, the bottom of the taper groove is a plane, and a variable-diameter taper tip is arranged at the center of the taper groove; by arranging a taper groove at the lower end of the flow regulating needle 10, the sample water pressure can be stabilized, the medium flowing through the flow regulating needle 10 can be stably regulated, and smooth flow of the medium through the valve body A is ensured; the flow regulating needle 10 is hung together with the pull rod 15 through the detachable connecting rod hook and the clamping groove arranged at the upper end of the flow regulating needle 10, and is indirectly connected with the handle 13; the design of the clamping groove and the hook facilitates disassembly and assembly of the handle 13 and the pull rod 15.

[0066] The flow regulating needle 10 moves up and down in the flow regulating cavity of the valve body A under the driving of the pull rod 15 and the clamping spring 14 with the rotation of the handle 13, thereby changing the contact area between the variable-diameter taper tip of the flow regulating needle 10 and the valve body A, and thereby changing the size of the sample water flow; in this embodiment, the larger the contact area, the smaller the flow, and to a certain extent, the medium is cut off; the smaller the contact area, the larger the flow, and to a certain extent, the size of the sample water flow no longer changes.

[0067] The second O-shaped sealing ring 11 is sleeved in the annular groove of the flow regulating needle 10; because the outer diameter of the second O-shaped sealing ring 11 is larger than the inner diameter of the flow regulating cavity, a sealing effect is formed when the flow regulating needle 10 moves up and down.

[0068] As a preferred embodiment, the safety bypass pressure control C includes a safety pressure sealing needle 9, a safety pressure sealing needle holder 8, a spring 7, a fixed cap 3 and a safety pressure adjusting rotary rod 6; wherein:

[0069] The fixed cap 3 is fixed on the valve body 1, and is sealed outside the first Teflon pad 2 and the second Teflon pad 16;

[0070] The safety pressure sealing needle 9 is clamped in the safety pressure sealing needle holder 8; one side of the safety pressure sealing needle 9 is conical, and the opposite side is cylindrical, and the radii of the contact surfaces of the safety pressure sealing needle 9 are equal;

[0071] One side of the safety pressure sealing needle holder 8 is provided with a boss coaxial with the center, and an un-penetrated coaxial circular groove is arranged on the plane of the boss;

[0072] One side of the safety pressure adjusting rotary rod 6 is provided with a circular groove, and the opposite side is provided with an internal hexagonal groove, a circular ring boss is arranged in the middle of the safety pressure adjusting rotary rod 6, and an annular groove is arranged in the middle of the circular ring boss;

[0073] The spring 7 is placed in the groove of the safety pressure adjusting rotary rod 6 and the safety pressure sealing needle holder 8.

[0074] The safety pressure sealing needle 9, the safety pressure sealing needle holder 8, the spring 7 and the safety pressure adjusting rotary rod 6 are sequentially placed in the safety pressure regulating cavity of the valve body A.

[0075] As a preferred embodiment, the first O-shaped sealing ring 5 is sleeved in the annular groove of the safety pressure adjusting rotary rod 6.

[0076] As a preferred embodiment, the outside of the safety pressure adjusting rotary rod 6 is provided with threads, and the spring 7 is connected with the threads, so that the pressure of the spring 7 can be changed by using the safety pressure adjusting rotary rod 6, and different safety pressure regulating pressures in the safety pressure regulating cavity can be controlled.

[0077] As a preferred embodiment, the inside of the fixed cap 3 is provided with a non-full-section threaded cavity and is connected with a through hole, and the outside of the fixed cap 3 is a full-section threaded step.

[0078] Working principle:

[0079] As shown in FIG. 1, when the system pressure is lower than the safety pressure, the medium is not enough to push open the safety pressure sealing needle 9, the medium flows out of the valve body according to the flow direction of Figure 4 As shown in FIG. 2, when the system pressure is higher than the safety pressure, the medium pushes open the safety pressure sealing needle 9 under the action of the system pressure, and the medium flows out of the high-pressure pipeline according to the flow direction of Figure 4 . Figure 5 Figure 5

[0080] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.​​

Claims

1. A hand sampling combination valve, which can simultaneously realize the functions of regulating flow and pressure relief protection, characterized in that, The utility model relates to a hand-operated sampling combination valve, which comprises a valve body (A), a valve head (B), a flow path and a safety bypass pressure control (C), wherein: the valve head (B) is installed on one side of the valve body (A) to control the opening, closing and flow of the medium; the safety bypass pressure control (C) is fixed on the other side of the valve body (A) opposite to the installation side of the valve head (B) to play a safety protection role in the equipment; both ends of the valve body (A) are provided with a threaded step with a slightly smaller diameter, and the valve body (A) is threadedly connected with the valve head (B) and the safety bypass pressure control (C) through the threaded step; both sides of the valve body (A) are respectively provided with a flow regulating cavity and a safety pressure regulating cavity, and the flow regulating cavity and the safety pressure regulating cavity are not penetrated and are isolated by a partition layer; the flow path comprises two medium flow channels, and the two medium flow channels are respectively a flow channel on the partition layer on the safety pressure regulating cavity side and a flow channel on the partition layer on the flow regulating cavity side by respectively arranging two circular holes on both sides of the partition layer; the valve body (A) further comprises an inlet channel and an outlet channel; the distance between the inlet channel of the valve body (A) and the flow channel on the partition layer on the safety pressure regulating cavity side is less than the distance between the outlet channel of the valve body (A) and the inlet channel and the flow channel on the partition layer on the safety pressure regulating cavity side. The hand-operated sampling combination valve further comprises a fastening fixing member, a sealing member and a sleeve joint (17), wherein the fastening fixing member comprises a first fastening nut (4) and a second fastening nut (12) arranged symmetrically on the left and right sides; the sealing member comprises a first Teflon pad (2) and a second Teflon pad (16) arranged symmetrically on the left and right sides, and a first O-shaped sealing ring (5) and a second O-shaped sealing ring (11); the sleeve joint (17) is threadedly connected to the left and right sides of the valve body (A); and the first O-shaped sealing ring (5) is arranged in the safety bypass pressure control (C).

2. A hand sampling manifold valve according to claim 1 wherein, The valve body (A) further comprises an inlet channel and an outlet channel; the distance between the inlet channel of the valve body (A) and the flow channel on the partition layer on the safety pressure regulating cavity side is 3 mm; and the distance between the outlet channel of the valve body (A) and the inlet channel and the flow channel on the partition layer on the safety pressure regulating cavity side is 4 mm.

3. A hand sampling manifold valve according to claim 2, wherein, Both sides of the middle section of the outer circular surface of the valve body (A) have two threaded holes, and a planar circular groove coaxial with the threaded holes is arranged.

4. A hand sampling manifold valve according to claim 3, wherein, The valve head (B) comprises a handle (13), a clamping spring (14), a pull rod (15) and a flow regulating needle (10), wherein:

5. A hand sampling manifold valve according to claim 4, wherein, one end of the pull rod (15) is provided with a small annular groove, the small annular groove fixes the pull rod (15) on the handle (13) through the clamping spring (14); the other end of the pull rod (15) is provided with a large annular groove, and one end of the pull rod (15) provided with the large annular groove is clamped on the clamping groove of the flow regulating needle (10); the handle (13) is fixed on the valve body (A); ​ The flow regulating needle (10) is arranged in the flow regulating cavity, the upper end of the flow regulating needle (10) is provided with a detachable connecting rod hook and a clamping groove, the middle end is provided with an annular groove, the lower end is provided with a tapered groove, the bottom of the tapered groove is a plane, and a variable-diameter tapered tip is arranged at the center of the tapered groove; the flow regulating needle (10) is hung together with the pull rod (15) through the detachable connecting rod hook and the clamping groove arranged at the upper end, and is indirectly connected with the handle (13); The flow regulating needle (10) moves up and down in the flow regulating cavity of the valve body (A) under the driving of the pull rod (15) and the clamping spring (14) with the rotation of the handle (13), thereby changing the contact area between the variable-diameter tapered tip of the flow regulating needle (10) and the valve body (A), and changing the size of the sample water flow.

6. A hand sampling manifold valve according to claim 5 wherein, The safety bypass pressure control (C) comprises a safety pressure sealing needle (9), a safety pressure sealing needle holder (8), a spring (7), a fixed cap (3) and a safety pressure adjusting rotary rod (6); wherein: The fixed cap (3) is fixed on the valve body (1) and is sealed outside the first Teflon pad (2) and the second Teflon pad (16); The safety pressure sealing needle (9) is clamped in the safety pressure sealing needle holder (8); one side of the safety pressure sealing needle (9) is conical, and the opposite side is cylindrical, and the contact surface radius of the safety pressure sealing needle (9) is equal; One side of the safety pressure sealing needle holder (8) is provided with a boss coaxial with the center, and an un-penetrated coaxial circular groove is arranged on the plane of the boss; One side of the safety pressure adjusting rotary rod (6) is provided with a circular groove, and the opposite side is provided with an internal hexagonal groove, a circular ring boss is arranged in the middle of the safety pressure adjusting rotary rod (6), and an annular groove is arranged in the middle of the circular ring boss; The spring (7) is arranged in the groove of the safety pressure sealing needle holder (8) and the safety pressure adjusting rotary rod (6); The safety pressure sealing needle (9), the safety pressure sealing needle holder (8), the spring (7) and the safety pressure adjusting rotary rod (6) are arranged in the safety pressure regulating cavity of the valve body (A) in sequence.

7. A hand sampling manifold valve according to claim 6 wherein, The first O-shaped sealing ring (5) is sleeved in the annular groove of the safety pressure adjusting rotary rod (6).

8. A hand sampling manifold valve according to claim 7, wherein, The outer side of the safety pressure adjusting rotary rod (6) is provided with threads, which are connected with the spring (7) through threads.

9. A hand sampling manifold valve according to claim 8, wherein, The inside of the fixed cap (3) is provided with a cavity with a non-full-section thread and a through hole, and the outside of the fixed cap (3) is a full-section thread step.

10. A hand sampling manifold valve according to claim 9, wherein, The second O-shaped sealing ring (11) is sleeved in the annular groove of the flow regulating needle (10); the outer diameter of the second O-shaped sealing ring (11) is greater than the inner diameter of the flow regulating cavity, and a sealing effect is formed when the flow regulating needle (10) moves up and down.

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